1252155540 has 96 divisors (see below), whose sum is σ = 3601269504. Its totient is φ = 324956160.

The previous prime is 1252155523. The next prime is 1252155547. The reversal of 1252155540 is 455512521.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1252155498 and 1252155507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1252155547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 353257 + ... + 356783.

It is an arithmetic number, because the mean of its divisors is an integer number (37513224).

Almost surely, 2^1252155540 is an apocalyptic number.

1252155540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1252155540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1800634752).

1252155540 is an abundant number, since it is smaller than the sum of its proper divisors (2349113964).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1252155540 is a wasteful number, since it uses less digits than its factorization.

1252155540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3697 (or 3695 counting only the distinct ones).

The product of its (nonzero) digits is 10000, while the sum is 30.

The square root of 1252155540 is about 35385.8098677987. The cubic root of 1252155540 is about 1077.8361854563.

The spelling of 1252155540 in words is "one billion, two hundred fifty-two million, one hundred fifty-five thousand, five hundred forty".